components/camel-http4/src/main/java/org/apache/camel/component/http4/HttpServletUrlRewrite.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.camel.component.http4;

import javax.servlet.http.HttpServletRequest;

import org.apache.camel.Producer;

/**
 * Extended {@link UrlRewrite} which leverages {@link HttpServletRequest}
 * during the rewrite process.
 * <p/>
 * For example the camel-urlrewrite component supports
 * {@link HttpServletUrlRewrite} implementations.
 */
public interface HttpServletUrlRewrite extends UrlRewrite {

    /**
     * Rewrite the url.
     *
     * @param url  the absolute url (eg with scheme://host:port/path?query)
     * @param relativeUrl optional relative url, if bridging endpoints, which then would be without the base path from the
     *                    endpoint from the given producer.
     * @param producer the producer to use the rewritten url
     * @param request  the http servlet request
     * @return the rewritten url, or <tt>null</tt> to use the original url
     * @throws Exception is thrown if error rewriting the url
     */
    String rewrite(String url, String relativeUrl, Producer producer, HttpServletRequest request) throws Exception;

}